Referring to an Innerspring Mattress, the coil count is the total number of Coils in the mattress.
Although it has been said that if there are more coils in a mattress then it is more supportive, today the coil count is not as important. They way the coils are made now is the most important factor when it comes to determining the amount of comfort and support of the mattress. Here are some helpful guidelines for coil count: